Nonchalant means rude and not proper so if someone would have that attitude it would mean that person wasn't a very polite person.
Not necessarily but a nonchalant attitude can be viewed as noncaring or detached.
Mood, Moody. melancholic, mean, miserable,
You pay attention and become interested.
If you appear before the judge with a smug, nonchalant attitude, he's more likely to impose the maximum sentence.
Nonchalant means not concerned or indifferent.
Connor MIlls
To be nonchalant about something means that someone is very easy going about something and acting as if it is easy or is not really that big of a deal to them.
The man was nonchalant
In texting, "w.e." typically stands for "whatever." It's often used to express indifference or dismissal regarding a topic or situation. The abbreviation conveys a casual or nonchalant attitude, implying that the sender is not particularly concerned about the matter at hand.
Nonchalant was born on 1970-10-18.
Nonchalant, he lifted her skirt, (which was hanging on the clothesline).
The noun is nonchalance.